Two-speed hydraulic ram



Aug. 1, 1950 B. F. ARPS 2,517,164

TWO-SPEED HYDRAULIC RAM Filed Feb. 19, 1947 2 Sheets-Sheet l ESU Aug. 1, 1950 B. F. ARPS 2,517,164

TWO-SPEED HYDRAULIC RAM Filed Feb. 19, 1947 2 Sheets-Sheet 2 IN V EN TOR.

Bel/No F A1805 BY Patented Aug. 1 1950 'rWo-srnnnH DaAULro Ran 1Y1 Bruno F. Arps, New Holstein, Wis; Application February 19, 1947, Serial'NoI 729,555

y y 1 l The present inventionrelates to means for controlling and operating a two speed ram, the controlling means comprising a valve box; controlling levers for the same, a regulator and a novel arrangement of rams. The present invention is a continuation in part of my copending application, Serial Number 722,613, filed January 17, 1947, Hydraulic Control Valve.

The principal object of the present invention is to provide a dual speed and dual power ram comprising a relatively large diameter-single acting ram and a relatively small in diameter double acting ram, wherein-the rams are mechanically connected together forsimultaneous movement in the same direction and provide a valvebox and regulator for controlling these rams whereby the double acting ram will raise andlo'wer the single acting ram atrelatively high speed, and the single acting ram will extend at relatively low speed but having greater power, the operations being at all times under the direct control of the operator through three controlling levers; r

' A further object of the present invention is to provide a hydraulic system whereby the operator mayby operating one of two levers,' move the ra at high speed in either directionat will and when desired can by the simple movement of another lever extend the rams at low speed with greatly increased lifting power.

f To these and other useful ends my invention consists of parts andcombinations of parts or their equivalents and mode ofoperation as hereinafter described and claimed and shown in the accompanying drawings in which: Fig. 1 is a perspective view of my improved two speed hydraulic ram system. Fig. 2 is a diagrammatic drawing illustrating the device as shown in Figure *1 3 As thus illustrated the valve box is designated in its entirety by reference character A the regulater by reference character B; the double acting ram is designatedby reference character C and the single acting ram is designated by reference character D. The hydraulic pump is designated by reference character E and the oil tank or sump is designated by referencecharacter F,

Member A is somewhatfsimilar to member I l in mycopending application, member B is some what similar to member 20 in my copending application. r Pump E has a suction 'pipe I leading from s'um'p'F and a discharge pipe H which leads to rave box A as illustrated'pa pipe-I 2 iormsa discharge connection from member A to sump F. Regulator Bfmay, be'mounted within the main valve box A or made in a separate unit as illustrated in Figure 1. Member A is providedwith aninlet: passageway l3 and an outlet passageway I4, each being connected to pipes Ill and I2 as illustrated. V y

I provide three spacedpassageways I5, t6 and H, which extend from passageway l3 to passageway I 4. The bottom of each of these passageways is adapted to-form a'seatfor balls 118. The balls being held on their seats by means of springs 19. The upper ends of the passageways are each provided with seats for the reception of balls 20. Ineach passageway I provide a skeleton piston 21 having a length about as illustrated which is adapted to hold balls .20 from the'ir seats when -balls l8 are seated. I provide a port 22 having a seat at its upper end on which ball 23 is held by spring 24. Thus it willbe seen that ball 23 will act as a relief valve between inlet and outletpassageways I 3 and l4. I pro vide means for operating the valvesin box A as follows: A bracket 36 is held for vertical movement to a post 31 mounted on member A, by means of links 32 and 33, whereby member 353 may move vertically, I provide three control levers 34; 35 and 36 each of which are hinged to member 30 as at-31l I provide'three slidably mounted pins 38 which are adapted to rest on balls and contact levers 34, 35 and 36 as at 39 when balls 20 are held in their raised position by springs 19.

I provideapassageway 40 which extends from inletpassa'geway l3 to outlet passageway M, the upper end being provided with a seat for thereception of a ball 4|. Member 33 has a forwardly extending arm 42;; I provide a slidably mounted pin 43 adapted to contact member 42 as at 44' when ball 4| is raised as illustrated. It will be seen that normally oil is free to pass through passageway 40 from inlet passageway It to outlet passageway l iunless ball 4! is seated. Theoperation of the levers is as follows:

When any one of levers 34, 35 or 36 is pulled, for example, to theleft as in Figure 2, one of rods 38 will be pushed downward and a skeleto piston 2l' will be pushed downward until a ball 20 is seated and a ball 18 is moved from its seat.

Movement of any lever to the left first causes the seating of its associated ball valve 20 andthe unseatin'g of associated ball valve IS. A further movementiof the lever to the leftlafteigball Zil has been seated will cause movement of member 30 about its pivots on post 3|. This movement of member causes a clockwise movement of member 42 about its pivot on post 3|, thus causing member 42 to depress rod 43 to force ball 4| on its seat.

Thus when a lever is pulled to the left, passageway 40 will be closed and a passageway l5, H3 or I! will be open to inlet passageway l3 and the oil must then, because of ball 4| being seated, pass into a tube connection to the regulator for a purpose which will hereinafter appear. It -will be seen, for example, that when lever 36 is pulled to the left passageway 15 will be open to inlet passageway l3, when lever is pulled to the left passageway IE will be open to inlet passageway l3 and when lever 34 is pulled to the left", pas sageway i! will be open to inlet passageway I3 and in each instance the passageway to outlet passageway 14 will be closed.

Member B has a cylinder in which pistons 5l-5I are slidably mounted, each piston having outer proieetions ,{52 and .5 3 and inward projec ti'o" and; 5]. l?" ag'et'va has'apip nectionb-t the left endcfcylhidr 50 a nd p se m 11 a tim h tl n in n t-ran is. {of w e na sa w y 16 e ve cdnneetion [3110 the center of cyimaer Y V Cylinder 5i) on'its left'end has" pag with a seat on which a ball Bl is held by mfians oi 'e n n -en fi dl A ne: so; H t onnw i h ball-E4 is held pymeans of aspiring it will be seenthe ref" that oil pressure from passageway l5 m hs new tt ntiv a n mmt hetefl p e sure f om passa 1 th u h pipe '57 wi mov pist n t e 16111 and m re ban" 9' me it s e? in fa lent-Pelee W f W l l be e p inedimvi lnreie i n 62' hi h are ada ed to mi th m vem o b lls ,5! an 5. thus s pistons 15! within bounds. ai h fiil n emi ha a p ste l r t 'l 'F Qh f Qte i tb f lav me n #3 a e wl nd fl es a els we:

nec tion l4 tame bottom of rain D. The outlet side ,of ball l has a pipe connection 1:5 to the top L of thecylinder (if m .C and t vou etcharnber e ra ch Pi e .i h gi b n n teen of ram C. v

, 2 se n that fo xann when v r is p led to the left oil pressure will accum 1g, lt he ilett end of cylinder SQQthiSwill move ,pis:

. t e i 'lp s je w y .1 'l lfi h stim s' inc eva'lve' .64 is held from its seatpil vvwill be f kwo iq'm th h t ed-s m n C t s i e pipes Wendi? ere-sew J1 eed-t iet 9 1th? a a y l4 Clearly rarn C maybe extended or retracted by mine o th e t ei her em .1 1 .1" 1. 'W e le .4 i P ed to th l 19 balls 29 an 4'. will be seated and oillwill flowirom passageway i th ent d iv ie 0 ki h i 5], moving pi'" H val es? .and -th'en a the eag e cf member raising awns n and 1. e an mm the re of m er Wi l w i e ll l ilfi w are il -els ills- 2 itr tetyrln it an; in gui d? 4 passageway 14 through passageway I5, and that when piston H is moved piston 10 will be free to follow.

When it is desired to extend the rams at low 7 speed and high power, lever 35 is pulled, when this occurs piston II will be free to move because the pressure between pistons 5| will open valves 6! and 64, leaving piston H free to move.

Thus it will be seen that rapid movement of piston -'I l ineithendirection is under the complete controlofthoperator and that this piston H may be stopped in any medial position because when the pressure used for moving this piston is shut off valves GI and 64 will be closed automatically and the rams will be held in position until any one of the three levers is moved.

I provide means to cushion or release excessive pressure in the'connection from pipes 15 and 16 as follows:

Devices moved by rams are frequently quite heavy; therefore a sudden closing ofa valve while the rams are moving rapi'dlymightcause vcoiis'idereiiblei'pre's'sure in" one "of these pipes. Valves 8}! '8 are held .on th'e'i' seatsbymeans'ofsprings al-"a'l, been valve having" ports s2 az iwme'hiead from pipes 1 5 and IGQsprings .8I' being heavy eno h to'hold the valves on" their seatsagainst normal er'epmgpr'essure, however a serious ineresem pressures/111 move either ofth'ese valves oif their seats, thus .to protect the device a'g'aint injur'yfby permitting the excessive pressure to new 'cynceer'sp' through outlets 83."

It .will be jseenthatby manipulating one of the lever theframjs may be moved'at'fwill either at hi' and medium power or atlow speed/fer ngthus'sliown and described myinvention, bla .l s a H M H I l L Ai tw o speed hydraulic ram comprising, a r ms, aivai "sox rias regunm'aseume M urehaving"connecti'dns to said valve box, said pair of'rams' comprisin'ga single acting arelalti velysmaller diameter doubleacting ram mechanically connected together for s1- rnultaneous movement in the same directionlopera ng connectio between said valve b'ex and regulated and between the regulator and rams, valves said' valvebox 'and iegulaterfmanufally sp m extending and retracting levers mounted an said'valve "boxwith means associated with said valves wherebysaid'double acting rain may be extended .andretractedI answer manually operated lever rrtd' onsaid valve "box with l w th eld es' g er f i a emmeY-be t e t ma i y operated means in said regulator whereby when field lss sp ie t w e eu te a s acting ra'n'itokxt end met" ct said "rarn'fsaid double acting rarn will .be raulic'allydree to extend or retrac't rand n when fluid pressllre is supplied to said d tie acting rain to i e re ee, fli ea e, 'f ih i Will 9.? radi a y f i fil i tfi br lief-rad? 1 A sense a in te -i n 1 u in said a to a i me ns be i ie tlt' k valves in the ends of said .regulaton a piston chamber etween said outlet check valves'with theinlet sideof the checkQvaIve extending directly into the piston chamber, two istons slidably r. l l f b f i Sam 5i$n h mb ev pr i r ons 5| to the vleft so as to open t ee gr en? i ent tled t extend the si g e acting ram the pistons will move outward and open both said check valves to provide a free passageway between the ends of the double acting ram and said outlet passageway.

3. In combination, a hydraulic pump having a sump, a single acting ram and a double acting ram mechanically connected together for simultaneous movement in the same direction, a valve box having inlet and outlet passageways, inlet and outlet pipes from said passageways to said pump and sump, a regulator, operating connections between said valve box and regulator and between the regulator and single and double acting rams, a manually operated lever having an operating connection to certain valves located in said valve box to cause their operation to positions in which they direct fluid pressure to extend said single acting ram, two other manually operated levers each having connections to certain other valves located in said valve box to cause their operation to positions in which they direct fluid pressure to said double acting ram to cause its extension or retraction, means whereby when said single acting ram is being extended said double acting ram will be permitted hydraulically to extend and whereby when said double acting ram i extended or retracted said single acting ram will be freed hy draulically to extend or retract.

4. In combination, a hydraulic pump having a sump, a single acting ram and a double acting ram mechanically connected together for simultaneous movement in the same direction, a valve box having inlet and outlet passageways, inlet and outlet pipes from said passageways to said pump and sump, a regulator, valves in said valve box and regulator, operating connections between said valve box and regulator and between said regulator and said rams, a manually operated lever having operating connections to certain valves for operating said valves so as to direct pressure fluid to extend said single acting ram, two manually operated levers having connections to certain valves to cause their operation so as to direct pressure fluid to extend or retract said double acting ram, said regulator having a me dially positioned cylinder with two spaced independent pistons, outlet spring held valves in opposite ends of said regulator, said cylinder between said pistons being operatively connected to said single acting ram and means whereby oil pressure for operating the single acting ram will move the pistons apart and open said outlet valves providing free oil passageways between the double acting ram and said outlet passageway, means whereby said single acting ram is left free hydraulically to move in either direction when its extending lever is in neutral position.

5. In an automatic regulator of the character described comprising, an elongated housing having outlet valves in the ends thereof, a piston chamber between said valves positioned concentric with the valves and having direct openings to the inlet sides of the valves, separate ports leading into the end of said piston chamber and a third port leading into the center of the piston chamber, two spaced pistons independently slidably mounted in said piston chamber having projections whereby when one or both pistons approach a check valve, the check valve will be opened, an outlet in said piston chamber at the center thereof, whereby when pressure is added to said third port, said pistons will be caused to move apart and open both check valves and whereby when pressure is added to either end of the piston chamber the pistons will be caused to move toward and open the check valve approached.

BRUNO F. ARPS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,968,422 Proctor et a1 July 31, 1934 2,057,087 De Millar Oct. 13, 1936 2,157,240 Keel May 9, 1939 2,243,364 Trautman May 27, 1941 

